Insulator-clamp.



LAOKBURN.

LATOR CLAMP.

on FILED D110. 2, 190a.

Patented Jan. 4, 1910.

INSU

APPLIOATI citizen of the United States, and resident of Kirkwood, St. Louis county, Missouri, have had to the accompanying a part hereof.

tors on cross arms utilized for supporting wires and cables, the ob ect of my lnventlon I which is easily and quickly applied ,to the JASPER BLACKBURN, OF KIRKWOOD, MISSOURI.

msULAToR-oLAMP'.

Specification of Letters Patent.

Patented Jan. 4, 1910.

Application filed December 2, 1908. Serial No. 465,712.

To all whom it may concern:

Be it known that I, JASPER BLACKBURN, a

invented certain new and useful Improvements in Insulator-Clamps, of which the following is a specification containing a full, clear, and exact description, reference being drawings, forming M invention relates to an insulator clamp particularly intended for use in clamping and maintainlng glass or porcelain insulabeing to provide a simple, inexpensive clamp cross arm without the necessity of boring a hole or holes through said crossarm, which action naturally. results in weakening the cross arm, and which clamp may be readily loosened when desired and adjusted in either direction upon thecross arm. To the above purposes, my invention consists in certain novelfeatures of constructionand arrangement of parts which will be hereinafter more fully set forth, pointed out in the claims, and illustrated in the accompanying drawings, in which: i v

Figure 1 is a side elevation of a clampof my improved. construction in positionupon a cross arm; Fig. 2 is a vertical section taken on the line 2-2 of Fig. 1; Fig. 3 is a horizontal section taken on'the line 3-2-3 of Fig.

1; Fi 4 is an elevation of the lower end of one o the vertical arms of the clamp; Fig.' 5 is a detail section taken on the line 5--5 of Fig. 2; Fig. 6 is a detail section showing the lower ends of the vertical arms of the clamp bent beneath the cross arm and permanently attached thereto; Fig. 7 is a detail sectionillustrating the locking lever used in connec-\ tion with the clamp; and Fig. 8 is a side elevation, partly in section, of a modified form of the clamp.

Referring by numerals to the accompanying drawings: 1 designates the main body of the clamp, which is of inverted U-shape and provided on top with a vertically disposed screw-threaded shank 2, which receives the wooden lain insu ator 4.

Formed integral with the vertically disposed sides of the body 1 are vertically discal portion outer face of a lug in 3 carrying the glass or porc'eposed ribs 5, and formed integral with the side edges of these vertically disposed arms are inwardly projecting ribs 6, which are knife-edged in order that they will embed themselves in the side faces of the cross arm when the clamp is positioned thereon, thus assisting in maintaining said clamp in a rigid position. These ribs also prevent water from passing beneath the side portions of the clamp, which action results in early decay of the cross arm beneath the clamp.

Formed integral with the under side of the upper portion or top of the clamp are prongs 7, which engage in the top of the cross arm, and formed integral with the side edges of this top portion of the clamp are ribs 8, which embed themselves in the top of the cross arm and perform the saniefunctions as do the ribs 6, previously described.

The lower end of one of the vertical arms ofthe body of the clamp 1 is bent outward, as designated by 9, and formed through this outwardly bent lower end is an opening 10, through which asses a locking bolt 11 provided on one end through the lower end of the opposite vertiofthe body of the clamp is an aperture '13, which is ada ted to receivethe corresponding end of the liolt 11, and which end is'provided with a lug 14, which when the bolt. is rotated so as to be moved into a locked position bears against the beveled formed on the corresponding vertical portion immediately above the opening 13.

Formed on or fixed to the center of the bolt 11 is a lever 16, which performs the function. of a handle for rotating the bolt 11, and formed integral with the end of said with a head 12, and formed lever at the point where the same joins the bolt 11 is an eccentric lug ,17. Formed integral with the opposite end of this lever is a prong ,18, which is under side of the cross arm when the lever is thrown intoa locked position. and formed through this end of the lever is an aperture 19, through which a nail or similar fastening device may be driven to permanently secure the lever in a locked position upon the cross arm.

'lhef'side portions of the vertical arms of the clampproject below the central portions of said vertical arms to form earsQO, which are perforated, and this construction iermits the clamp to be permanently attach'ec to the cross arm by bending said cars into horizontal planes against the under side of the cross arm, and driving nailsor like'fastening de-' adapted to engage in the lOO vices through perforations in saidars 20 (see Fig. 6).

When a clamp of my improved construction is to be applied to a cross arm, the end of the bolt 11 bearing the lug 14; is disengaged from the aperture 13, and said bolt hangs in a vertical'position from the out wardly bent lower end 9', as shown by dotted lines in Fig. 2, and said clamp is now seated on the cross arm with the 'prongs 7 and the sharpened ribs 6 and 8 engaging in said cross arm, and the bolt 11 is now shifted into a horizontal position and the end bearing the lug 14 is inserted through the aperture 18.

With the parts so arranged, the lever 16 occupies a vertical position, as seen in Fig. 7, and as said lever is engaged and swung upward into position against the under side of the cross arm, the lug 14 will ride against the beveled face 15 of the lug immediately above the aperture 13, thus drawing the lower ends of the vertical portions of the clamp into close engagement with the sides of the cross arm, and at the same time the lug 17 will bear against the under side of the cross arm in such a manner as to clamp the bolt in its locked position, and the lever iscaused to maintain its locked position by driving the prong 18 into the cross arm, or by driving a nail through the aperture 19.

The glass or porcelain insulator 9 may be located directly upon the shank 2 or upon a wooden pin 3 carried by said shank, and thus the insulator is held in a firm and substantial position upon the cross arm,'and when desired the clamp may be readily detached from the cross arm by engaging the lever 16 and rocking the bolt 11 into position where the lug 14 may be drawn through the aperture 13.

In Fig. 8 I have shown a modified construction of the clamp wherein the body of said clamp is made in two parts, hinged to- 5 geth'er at one of the lower corners, as designated by 21, and the joint between the two parts being through the center of the threaded shank which carries the wooden pin or glass insulator. E An insulator clamp of .my improved construction may be easily and quickly placed l I l I in position upon or removed from a cross arm, can be permanently attached to the cross arm by utilizing nails or like fastening 1 devices, and by the use of my improved clamp the necessity of boring holes in the cross arm is done away with, which action necessarily weakens said cross arm. I claim: i 1. An insulator clamp, comprising an inverted U-shaped body, a shank carried there- 2 by and adapted to receive the insulator,. and means engaging the lower ends of the body of the clamp for locking said clamp to a cross arm, and drawing the lower ends gaging the cross arm,

carried by said body for receiving an insulator, the lower ends of which'clampextend below the under side of the cross arm, and means passing through the extended lower ends of theloody of the clamp for locking the same to the cross arm, and draw-- ing the lower ends of the vertical portions of the clamp into close engagement with the sides of said arm.

3. An insulator clamp, comprising a body adapted to engage over a cross arm, a shank carried by said body for receiving an in sulator, the lower ends of which clamp extend below the under side of the ero'ssarm, and a locking bolt passing through the extended lower ends of the body of the clamp for locking the same to the cross arm, and drawing the lower ends of the vertical. portions of the'clamp into close ei'igagenient with the sides of said arm. a

4. An insulator clamp, comprising a body adapted to engage over a cross arm, a shank carried by said body, for receiving an insulator, the lower ends of which clamp extend below the under side of the cross arm, a locking bolt passing through the extended lower ends of the body of the clamp for locking the same to the cross arm, and an operating lever carried by the locking bolt.

5. An insulator clamp, comprising an inverted U-shaped body adapted to engage over "a cross arm, the lower endsof which body project below the under side of the cross arm, a shank carried by the body for receiving an insulator, knife-edged ribs in tegral with the body of the clamp for engaging the cross arm, and means passing through the lower ends of the body of the clamp for locking the same on the cross arm.

(3. An insulator clamp, comprising an inverted U-shaped body adapted to engage over a cross arm, the lower ends of which body project below the under side of the 5 cross arm, a shank carried by the body for receiving an insulator, knife-edged ribs in tegral with the body of the clamp for ena locking bolt passing through the lower ends of the, body of the clamp, and a lever carried bysaid locking bolt and adapted to bear against the under side of the cross arm to a locked position.

In testimony whereof, I have signed my hold said bolt in i name to this specification, in presence.v of

two subscribing witnesses.

JASPER BLACKBURN. Witnesses M. P. SMITH, E. L. WALLACE. 

